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| Titel |
FRESCO v6: improvements in cloud detection and new applications |
| VerfasserIn |
Ping Wang, Ronald van der A, Olaf Tuinder, Piet Stammes |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047177
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| Zusammenfassung |
| The FRESCO (Fast Retrieval scheme for Clouds from the Oxygen A band) cloud
retrieval algorithm has been developed as a simple but fast and efficient algorithm for
GOME, SCIAMACHY and GOME-2. FRESCO employs the O2 A band at 760 nm
to detect clouds. The FRESCO effective cloud fraction and cloud pressure have
been used in the trace gas retrievals from GOME, SCIAMACHY and GOME-2.
FRESCO v6 is an upgrade of the current FRESCO+ by using new databases and
by providing more products. FRESCO v6 uses the high spatial resolution surface
albedo climatologies derived from MERIS and the latest O2 line parameters from
HITRAN 2008. Therefore the effective cloud fraction and cloud pressure are more
accurately derived. Besides the widely used effective cloud fraction and cloud pressure
products, FRESCO v6 provides scene albedo and scene pressure for every pixel
and the broadband surface solar irradiance for non-snow/ice pixels. In previous
FRESCO versions, the scene albedo and scene pressure were only retrieved for
pixels over snow/ice surface. The scene pressure could be interesting for cases
with optically thick absorbing aerosol layers, for example for smoke aerosols and
volcanic ash. The broadband surface solar irradiances (SSI) are derived from the
effective cloud fractions using the MAGIC algorithm (Mesoscale Atmospheric Global
Irradiance Code). The consistency and the accurate calibration of the GOME and
SCIAMACHY instruments make it possible to construct a stable SSI time series for
climate research. In this presentation we will demonstrate the improvements of the
FRESCO v6 products and give some examples for the application of the new products. |
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